Professional and players from overseas can play in major competition overseas similar to Football. Back in the day you just played in your home country and options of moving to Japan, England and Europe were not there.

Then by that definition, the game isnt fully professinal, because the int players are severly restricted from the Super 14

"The PFA does not represent players when they have broken the law and been convicted on non-football matters."- Gordon Taylor in 2009 following Marlon King's release after a prison sentence for sexual assault & ABH